期刊文献+
任意字段
题名或关键词
题名
关键词
摘要
作者
第一作者
机构
刊名
分类号
参考文献
作者简介
基金资助
栏目信息
共找到2,964篇文章
< 1 2 … 149 >
每页显示 20 50 100
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
显示方式：
Effects of Zr2Cu Packing Modification on Microstructure and Mechanical and Ablation Properties of PIP-Prepared C/C-SiC-ZrC Composites 认领 引用
1
作者 Xie Jing Zhang Qian +6 位作者 Ren Jing Su Hailong Tian Lulu Zhi Xionghui Sun Guodong Li Hui Wang Long 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第8期1940-1946,共7页
To improve the compactness and properties of C/C-SiC-ZrC composites produced by precursor infiltration and pyrolysis(PIP)method,the low-temperature reactive melt infiltration(RMI)process was used to seal the composite... To improve the compactness and properties of C/C-SiC-ZrC composites produced by precursor infiltration and pyrolysis(PIP)method,the low-temperature reactive melt infiltration(RMI)process was used to seal the composites using Zr2Cu as the filler.The microstructure,mechanical properties,and ablation properties of the Zr2Cu packed composites were analyzed.Results show that during Zr2Cu impregnation,the melt efficiently fills the large pores of the composites and is converted to ZrCu due to a partial reaction of zirconium with carbon.This results in an increase in composite density from 1.91 g/cm3to 2.24 g/cm3and a reduction in open porosity by 27.35%.Additionally,the flexural strength of Zr2Cu packed C/C-SiC-ZrC composites is improved from 122.78±8.09 MPa to 135.53±5.40 MPa.After plasma ablation for 20 s,the modified composites demonstrate superior ablative resistance compared to PIP C/C-SiC-ZrC,with mass ablation and linear ablation rates of 2.77×10−3g/s and 2.60×10−3mm/s,respectively.The“selftranspiration”effect of the low-melting point copper-containing phase absorbs the heat of the plasma flame,further reducing the ablation temperature and promoting the formation of refined ZrO2particles within the SiO2melting layer.This provides more stable erosion protection for Zr2Cu packed C/C-SiC-ZrC composites. 展开更多
关键词 C/C-SiC-ZrC composites Zr2Cu packing microstructure mechanical property ablation property
暂未订购 下载PDF
Introducing High-Volume-Fraction Ultrafine Grains to Obtain Superior Balance of Strength and Electrical Conductivity for Cu/Al2O3Composite 认领 引用
2
作者 Zhang Jun Liu Xi +7 位作者 Li Yi Chang Guo Peng Haoran Zhang Shuang Huang Qi Zhao Xueni Li Liang Huo Wangtu 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第4期908-919,共12页
Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate u... Compared with Cu/Al2O3composites,high-strength Cu/Al2O3composites usually exhibit obviously deteriorated electrical conductivity.A chemical and mechanical alloying-based strategy was adopted to fabricate ultrafine composite powders with lowcontent reinforcement and constructed a combined structure of Cu ultrafine powders covered with in-situ Al2O3nanoparticles.After consolidation at a relatively lower sintering temperature of 550℃,high-volume-fraction ultrafine grains were introduced into the Cu/Al2O3composite,and many in-situ Al2O3nanoparticles with an average size of 11.7±7.5 nm were dispersed homogeneously in the Cu grain.Results show that the composite demonstrates an excellent balance of high tensile strength(654±1 MPa)and high electrical conductivity(84.5±0.1%IACS),which is ascribed to the synergistic strengthening effect of ultrafine grains,dislocations,and in-situ Al2O3nanoparticles.This approach,which utilizes ultrafine composite powder with low-content reinforcement as a precursor and employs low-temperature and high-pressure sintering subsequently,may hold promising potential for large-scale industrial production of high-performance oxide dispersion strengthened alloys. 展开更多
关键词 Cu/Al2O3composite ultrafine grain in-situ Al2O3nanoparticle strengthening mechanism electrical conductivity
暂未订购 下载PDF
FeOOH/Cu2O复合粉体的制备及其光催化性能 认领 引用
3
作者 邹欣伟 王雨 +1 位作者 王国斌 张旭明 《太原科技大学学报》 2026年第4期355-360,共6页
为提高氧化亚铜在可见光下的光催化效率,引入羟基氧化铁,制备出羟基氧化铁/氧化亚铜复合粉体材料。研究了羟基氧化铁的用量对氧化亚铜降解性能的影响,利用紫外可见漫反射光谱(UV-Vis)分析了复合材料的光吸收性能。结果表明:该复合粉体... 为提高氧化亚铜在可见光下的光催化效率,引入羟基氧化铁,制备出羟基氧化铁/氧化亚铜复合粉体材料。研究了羟基氧化铁的用量对氧化亚铜降解性能的影响,利用紫外可见漫反射光谱(UV-Vis)分析了复合材料的光吸收性能。结果表明:该复合粉体材料在光催化降解甲基橙中展现出优异的性能。其所构建的异质结结构和特殊的能带结构,有效地促进了光生电子-空穴的分离。同时,相比较于单一氧化亚铜,该复合粉体材料有效提升了光催化性能,在光反应150 min时对甲基橙溶液的降解速率达到70%. 展开更多
关键词 氧化亚铜 羟基氧化铁 复合粉体 光催化降解
暂未订购 下载PDF
The Effect of Oxide Particle Addition on the High Temperature Properties and Ablation Resistance of Quartz/Ceramicizable Phenolic Resin Composite Materials 认领 引用
4
作者 ZHOU Rui DING Jie +3 位作者 WU Tengfei LU Xiaodie CHEN Jingyu LI Zhiqiang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS CSCD 2026年第3期820-827,共8页
In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenol... In order to investigate the effects of oxide particles on the high-temperature resistance and ablation performance of ceramicizable phenolic resin composites,three types of quartz fiber-reinforced ceramicizable phenolic resin composites were prepared using MgO particles or Al2O3 particles as the second-phase oxides and ZrB2 particles as the high-temperature ceramic filler,through a mold pressing process.The enhancement effects and mechanisms of the added second-phase oxides on the high-temperature resistance and ablation performance of the composites were discussed and analyzed through high-temperature testing,phase characterization,oxyacetylene testing,and microstructure characterization.The results show that ZrB2 particles oxidize to form ZrO2 and B2O3 in an oxygen-rich high-temperature environment.The added second-phase oxide particles can react with B2O3 to form corresponding borates,thereby strengthening the matrix.After treatment at 800℃,the flexural strength of the ZrB2-MgO quartz fiber-reinforced phenolic resin composite(QFPR/ZM)increased by 55.3%compared to the ZrB2 quartz fiber-reinforced phenolic resin composite(QFPR/Z).The oxyacetylene ablation performance of the composites with added oxide particles was significantly influenced by the generated borates.Mg3B2O6 has a higher high-temperature viscosity than Al18B4O33 at high temperatures,resulting in a lower linear ablation rate for QFPR/ZM compared to the ZrB2-Al2O3 quartz fiber-reinforced phenolic resin composite(QFPR/ZA). 展开更多
关键词 MgO Al2O3 phenolic resin ceramicizable composite mechanical properties
暂未订购 下载PDF
In-situ reconstructed Cu-In2O3 electron-rich interfaces facilitate high selective CO2-to-CO conversion at low potentials 认领 引用
5
作者 Bin Yang Ouardia Akdim +6 位作者 Chengcheng Yuan Ruina Li Luo Yu Hermenegildo García Jiaguo Yu Graham J.Hutchings Panyong Kuang 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2026年第6期117-129,共13页
The electroreduction of CO2to CO is fundamentally hindered by sluggish COOH intermediate formation and the competing hydrogen evolution reaction.Herein,we show that this challenge can be addressed through the dynam... The electroreduction of CO2to CO is fundamentally hindered by sluggish COOH intermediate formation and the competing hydrogen evolution reaction.Herein,we show that this challenge can be addressed through the dynamic in-situ reconstruction of a CuO/In2O3precursor under electrochemical CO2reduction conditions.By employing in-situ electrochemical spectroscopy techniques in combination with theoretical calculations,we demonstrate that the presence of In2O3facilitates the complete reduction of CuO to metallic Cu.This in-situ reconstruction produces electron-rich Cu-In2O3interfaces,characterized by a reduced work function and an upshifted Cu 3d-band center,which promote CO2activation and the formation of COOH/CO intermediates.Those interfacial properties lead to a pronounced electronic coupling that endows the electrocatalyst with high CO2-to-CO selectivity at low potentials.Specifically,the optimised Cu/In2O3achieves CO Faradaic efficiency above 90%across−0.5 to−0.9 V vs.the reversible hydrogen electrode,reaching 97.6%at−0.6 V in a H-type cell,and sustains a high CO selectivity of 96.0%even at an ultralow potential of−0.2 V in a flow-cell configuration.These findings underscore the crucial role of electron-rich interfaces in directing CO2reduction with exceptional selectivity and activity toward CO formation. 展开更多
关键词 CO2reduction reaction In-situ reconstruction Cu/In2O3composite Electron-rich interface CO2-to-CO conversion
暂未订购 下载PDF
Cu2O/N,S-BiOBr复合光催化剂的制备及其降解性能 认领 引用
6
作者 刘丹阳 景苗苗 +5 位作者 赵强 王俊丽 贾治芳 李作鹏 王科伟 郭永 《材料研究学报》 EI CAS CSCD 北大核心 2026年第5期333-342,共10页
用水热法合成了Z型异质结Cu2O/N,S-BiOBr复合光催化剂,并表征其组成、形貌、光电性质及其在可见光照射下对四环素(TC)的光催化降解性能,研究了Cu2O负载量对这种催化剂在可见光下催化降解TC的性能和稳定性的影响及其机制。结果表明... 用水热法合成了Z型异质结Cu2O/N,S-BiOBr复合光催化剂,并表征其组成、形貌、光电性质及其在可见光照射下对四环素(TC)的光催化降解性能,研究了Cu2O负载量对这种催化剂在可见光下催化降解TC的性能和稳定性的影响及其机制。结果表明,Cu2O掺杂量为10%(质量分数)的催化剂10%Cu2O/N,S-BiOBr催化性能最优,在100 min内可降解85.63%的TC。这种催化剂光降解效率较高的原因是,在Cu2O和N,S-BiOBr之间高效的界面电荷转移和协同作用提高了光生电子空穴对的分离效率,从而使其光催化降解性能提高。超氧自由基(⋅O2−)和羟基自由基(·OH)是光催化降解TC的主要活性物质。 展开更多
关键词 复合材料 Cu2O/N S-BiOBr 水热法 光催化 降解 四环素
暂未订购 下载PDF
Morphology and Frictional Characteristics Under Electrical Currents of Al_2O_3/Cu Composites Prepared by Internal Oxidation 认领 引用 被引量：10
7
作者 刘瑞华 宋克兴 +3 位作者 贾淑果 徐晓峰 郜建新 国秀花 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期281-288,共8页
Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and coppe... Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope （SEM） and energy dispersive X-ray spectrum （EDS）. The results show that the wear resistance of the Al2O3/Cu composites is superior to that of copper under the same conditions, Under a given electrical current, the wear rate of Al2O3/Cu composites decreases as the Al2O3-content increases, However, the wear rates of the Al2O3/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al2O3/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise. 展开更多
关键词 Al2O3/Cu composite internal oxidation friction and wear surface morphology current carder
暂未订购 下载PDF
Fabrication of an in-situ nanoAl_2O_3/Cu composite with high strength and high electric conductivity 认领 引用 被引量：7
8
作者 SHENYutian ZHUJing +2 位作者 XUYanji WANGBaoheng LITongze 《Rare Metals》 SCIE EI CAS 2005年第1期46-54,共9页
A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties ... A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties of the composite, and the process flow weresystematically studied. It is confirmed that this new technique simplifies the process and improvesthe properties of the composite. X-ray analysis indicates that the alumina particles formed duringinternal oxidation consist of a large mount of gamma-Al_2O_3 and a certain amount of theta-Al_2O_3and alpha-Al_2O_3. TEM observation shows that the obtained gamma-Al_2O_3 nano-particles areuniformly distributed in the copper grains; their mean size and space between particles are 7 runand 30 nm, respectively. The main properties of the composite with 50 percent cold deformation areas follows: the electric conductivity is 51 MS/m (87 percent IACS), sigma_b = 628 MPa, and thehardness is HRB86. After annealing at 1273 K, all or most of the above properties remain, and themicrostructures are still dependent on elongated fiber-form grains. 展开更多
关键词 Al_2O_3/Cu composite internal oxidation dispersion strengthening microstructure property
暂未订购 下载PDF
In situ TiB2/Cu composites fabricated by spray deposition using solid-liquid and liquid-liquid reactions 认领 引用 被引量：10
9
作者 Dan CHEN Yi-hui JIANG +4 位作者 Yu-fa LI Di LIU Jiang-tan HE Fei CAO Shu-hua LIANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第7期1849-1856,共8页
In situ TiB2/Cu composites were fabricated by both solid-liquid(S-L)and liquid-liquid(L-L)reactive spray deposition in combination with cold rolling and annealing.The microstructure and properties of the fabricated Ti... In situ TiB2/Cu composites were fabricated by both solid-liquid(S-L)and liquid-liquid(L-L)reactive spray deposition in combination with cold rolling and annealing.The microstructure and properties of the fabricated TiB2/Cu composites were investigated.The results show that the reactive mode and rolling treatment are the main factors affecting the microstructure and properties of the TiB2/Cu composite.The in situ reaction in the L-L reaction can be carried out more completely.By controlling the rolling and annealing process,the relative density and the properties of the as-deposited composites are optimized.The comprehensive performance of the deformed TiB2/Cu composite prepared by L-L reactive spray deposition(401 MPa and 83.5%IACS)is better than that by S-L reactive spray deposition(520 MPa and 20.2%IACS). 展开更多
关键词 in situ TiB2/Cu composite reactive spray deposition electrical conductivity tensile strength
暂未订购 下载PDF
纳米Bi2O3和Sb2O3掺杂对Y-Ba-Cu-O超导块材生长和性能的影响 认领 引用
10
作者 李国政 王妙 《物理学报》 SCIE EI CAS CSCD 北大核心 2026年第16期266-272,共7页
RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方... RE2Ba4CuMOy(REM-2411,RE为稀土元素,M=Nb,W,Sb,Bi等)具有化学稳定性好且能在RE-Ba-Cu-O(REBCO)超导基体内自发成纳米尺寸的优点,近些年得到了广泛的研究.利用金属氧化物掺杂在REBCO中原位生成REM-2411是一种更简单、高效的方法.本文采用011型熔渗生长工艺研究纳米BiO3和SbO3掺杂对Y-Ba-Cu-O(YBCO)超导块材生长和性能的影响.结果表明,质量分数0.5%的纳米BiO3掺杂不会影响YBCO块材的正常生长,且样品的悬浮力和Jc性能均有所提升.但质量分数0.5%纳米SbO3掺杂的样品的生长区明显缩小,且整个生长区出现周期性宏观偏析带现象,同时样品的悬浮力和J性能显著降低.高掺杂量(质量分数5%)样品的X射线衍射分析结果证实了纳米BiO3/SbO3掺杂的样品中出现了YBi-2411/YSb2411相.扫描电子显微镜结果表明,质量分数5%纳米BiO3掺杂的样品中观察到大量的YBi-2411纳米粒子,其分布密度极高,表明在YBCO体系中原位生成YBi-2411纳米粒子非常容易.综合掺杂物对样品生长和性能的影响,纳米BiO3可视为针对YBCO超导块材的一种安全且优异的掺杂物,也有潜力成为提升所有REBCO系列超导体性能的通用掺杂物.本文结果对进一步提高YBCO超导块材的性能有重要意义。 展开更多
关键词 Y-Ba-Cu-O 熔渗生长 纳米BiO3掺杂 纳米Sb2O掺杂 超导性能
暂未订购 下载PDF
Cu/Cu2O催化剂的制备及其电催化硝酸盐产氨性能研究 认领 引用
11
作者 李松泽 胡茂从 《现代化工》 CAS CSCD 北大核心 2026年第7期101-105,共5页
以泡沫铜为基底,经预处理、空气煅烧制备CuO电极。通过原位电化学重构法,在电解液中分别于-1.0、-1.4、-1.6 V(vs.Ag/AgCl)恒定电位下还原60 min,成功制备3种Cu/Cu2O复合催化剂。该催化剂由Cu0和Cu+共同组成,在电化学还原过程... 以泡沫铜为基底,经预处理、空气煅烧制备CuO电极。通过原位电化学重构法,在电解液中分别于-1.0、-1.4、-1.6 V(vs.Ag/AgCl)恒定电位下还原60 min,成功制备3种Cu/Cu2O复合催化剂。该催化剂由Cu0和Cu+共同组成,在电化学还原过程中发生表面价态变化与结构演变,其中由-1.4 V(vs.Ag/AgCl)还原的Cu/Cu2O复合催化剂表现出最优电催化硝酸盐还原制氨性能,氨产率达5704.6μg/(h·cm2),法拉第效率高达98.7%,为廉价高效制氨催化剂的设计提供了有效途径。 展开更多
关键词 泡沫铜 原位电化学重构 Cu/Cu2O复合催化剂
暂未订购 下载PDF
Al-Si/Al_2O_3 in situ composite prepared by displacement reaction of CuO/Al system 认领 引用 被引量：3
12
作者 Zhang Jing Yu Huashun +1 位作者 Chen Hongmei Min Guanghui 《China Foundry》 SCIE CAS 2010年第1期19-23,共5页
Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al2O3 . The microstructure was observed by means of OM, SEM and TEM. The Al2O3 particles in sub-micron sizes distribute unifor... Al2O3 particle-reinforced ZL109 composite was prepared by in situ reaction between CuO and Al2O3 . The microstructure was observed by means of OM, SEM and TEM. The Al2O3 particles in sub-micron sizes distribute uniformly in the matrix, and the Cu displaced from the in situ reaction forms net-like alloy phases with other alloy elements. The hardness and the tensile strength of the composites at room temperature have a slight increase as compared to that of the matrix. However, the tensile strength at 350℃ has reached 90.23 MPa, or 16.92 MPa higher than that of the matrix. The mechanism of the reaction in the CuO/AI system was studied by using of differential scanning calorimetry（DSC） and thermodynamic calculation. The reaction between CuO and Al involves two steps. First, CuO reacts with Al to form Cu20 and Al2O3 at the melting temperature of the matrix alloy, and second, Cu20 reacts with Al to form Cu and Al2O3 at a higher temperature. At ZL109 casting temperature of 750- 780 ℃, the second step can also take place because of the effect of exothermic reaction of the first step. 展开更多
关键词 aluminium matrix composites in situ reaction Al2O3 particles ZL109 CuO
暂未订购 下载PDF
Effect of La_2O_3 on electrical friction and wear properties of Cu-graphite composites 认领 引用 被引量：6
13
作者 莫飞 凤仪 +4 位作者 陈阳明 王雨晴 钱刚 豆亚坤 张学斌 《Journal of Rare Earths》 SCIE EI CAS CSCD 2015年第3期327-333,共7页
Sliding friction and wear experiments using Cu-La2O3-graphite composites against Cu-5 wt.%Ag alloy ring were conducted at a constant sliding speed of 10 m/s, a current density of 10 A/cm2 and a load of 2.5 N/cm2. Thes... Sliding friction and wear experiments using Cu-La2O3-graphite composites against Cu-5 wt.%Ag alloy ring were conducted at a constant sliding speed of 10 m/s, a current density of 10 A/cm2 and a load of 2.5 N/cm2. These composites with different La2O3 and graphite contents were fabricated by hot-pressing. Physical and mechanical properties of the composites were examined. Morphologies of the worn surface of composites were observed using optical microscopy. X-ray photoelectron spectroscopy spectra were used to study compositions of the lubricating film. The results showed that with the increasing addition of La2O3, hardness, flexural strength and electrical resistivity increased, but the relative density dropped. The friction coefficient increased with the increasing addition of La2O3. Composite containing 3 vol.% of La2O3 and 37 vol.% of graphite showed the best wear resistance. The main wear mechanisms of composites were abrasive wear, oxidative wear and adhesive wear. 展开更多
关键词 Cu-La2O3-graphite composites electrical contacts contact voltage drop friction wear rare earths
暂未订购 下载PDF
Model of critical strain for dynamic recrystallization in 10%TiC/Cu-Al_2O_3 composite 认领 引用 被引量：5
14
作者 杨志强 刘勇 +1 位作者 田保红 张毅 《Journal of Central South University》 SCIE EI CAS 2014年第11期4059-4065,共7页
Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the tempe... Using the Gleeble-1500 D simulator, the hot deformation behavior and dynamic recrystallization critical conditions of the 10%Ti C/Cu-Al2O3(volume fraction) composite were investigated by compression tests at the temperatures from 450 °C to 850 °C with the strain rates from 0.001 s-1 to 1 s-1. The results show that the softening mechanism of the dynamic recrystallization is a feature of high-temperature flow true stress-strain curves of the composite, and the peak stress increases with the decreasing deformation temperature or the increasing strain rate. The thermal deformation activation energy was calculated as 170.732 k J/mol and the constitutive equation was established. The inflection point in the lnθ-ε curve appears and the minimum value of-(lnθ)/ε-ε curve is presented when the critical state is attained for this composite. The critical strain increases with the increasing strain rate or the decreasing deformation temperature. There is linear relationship between critical strain and peak strain, i.e., εc=0.572εp. The predicting model of critical strain is described by the function of εc=1.062×10-2Z0.0826. 展开更多
关键词 10%Ti C/Cu-Al2O3 composite hot deformation constitutive equation dynamic recrystallization critical condition
暂未订购 下载PDF
Influence of current density on nano-Al_2O_3/Ni+Co bionic gradient composite coatings by electrodeposition 认领 引用 被引量：1
15
作者 Yan Liu Luquan Ren +1 位作者 Sirong Yu Zhuwu Han 《Journal of University of Science and Technology Beijing》 2008年第5期633-637,共5页
Metal and nano-ceramic nanocomposite coatings were prepared on the gray cast iron surface by the electrodeposition method. The Ni-Co was used as the metal matrix,and nano-Al2O3 was chosen as the second-phase particula... Metal and nano-ceramic nanocomposite coatings were prepared on the gray cast iron surface by the electrodeposition method. The Ni-Co was used as the metal matrix,and nano-Al2O3 was chosen as the second-phase particulates. To avoid poor inter-face bonding and stress distribution,the gradient structure of biology materials was found as the model and therefore the gradient composite coating was prepared. The morphology of the composite coatings was flatter and the microstructure was denser than that of pure Ni-Co coatings. The composite coatings were prepared by different current densities,and the 2-D and 3-D morphologies of the surface coatings were observed. The result indicated that the 2-D structure became rougher and the 3-D surface density of apices became less when the current density was increased. The content of nanoparticulates reached a maximum value at the current density of 40mA·cm^-2,at the same time the properties including microhardness and wear-resistance were analyzed. The microhardness reached a maximum value and the wear volume was also less at the current density of 40mA·cm^-2. The reason was that nano-Al2O3 particles caused dispersive strengthening and grain refining. 展开更多
关键词 electrodeposition composite coating current density nano-Al2O3 microstructure mechanical properties
暂未订购 下载PDF
High Temperature Deformation of Al_2O_3/Cu Composites 认领 引用 被引量：3
16
作者 Jianjun WU. Yun ZHANG, Yanfei JIANG and Meiyun XUE Department of Material Science and Engineering, Hebei University of Technology, Tianjin 300130, China Tingquan LEI School of Materials Science and Engineering, Harbin Institute of Technology, Uarbin 15000 《Journal of Materials Science & Technology》 SCIE EI CAS 2001年第3期325-328,共4页
This work concerns with the high temperature deformation of internally oxidized Al2O3/Cu composites. The investigation revealed that dispersive alumina can obstruct dislocation sliding and define the subgrain size the... This work concerns with the high temperature deformation of internally oxidized Al2O3/Cu composites. The investigation revealed that dispersive alumina can obstruct dislocation sliding and define the subgrain size thereby improve significantly the strength of the materials at high temperature. The sliding of dislocations is a main deformation mechanism in the given temperature range. The sliding of grain boundary and diffusive creep play important roles at high temperature and low strain rate. The dispersoids can raise the recrystallization temperature to higher than 1223 K. Dynamic recovery is a main softening way under the experimental conditions. Higher deformation rate and lower deformation temperature imply a higher flow stress. 展开更多
关键词 High Temperature Deformation of Al2O3/Cu Composites Cu Al
暂未订购 下载PDF
ErCu/TiO2对N2O的催化分解性能与机理 认领 引用
17
作者 高宇 李坤 《环境工程学报》 CAS CSCD 北大核心 2025年第4期978-987,共10页
为解决氨动力船舶的N2O排放问题,助力全球航运业加快绿色转型发展,该研究利用浸渍法合成出不同稀土元素改性的Cu/TiO2催化剂,考察了不同稀土元素对N2O去除性能的影响,优化了ErxCu/TiO2催化剂对N2O的去除性能。通过评... 为解决氨动力船舶的N2O排放问题,助力全球航运业加快绿色转型发展,该研究利用浸渍法合成出不同稀土元素改性的Cu/TiO2催化剂,考察了不同稀土元素对N2O去除性能的影响,优化了ErxCu/TiO2催化剂对N2O的去除性能。通过评估不同Er负载量对N2O催化分解性能的影响,获得了性能优化的Er10Cu/TiO2催化剂。利用X射线衍射、N2吸附-脱附、氧气程序升温脱附、氢气程序升温还原、原位漫反射红外傅立叶变换红外光谱等材料表征测试方法,深入探究相关反应机理。结果表明,相较于LaCu/TiO2、CeCu/TiO2、PrCu/TiO2、HoCu/TiO2催化剂,ErCu/TiO2催化剂具有更加优异的N2O催化分解性能。采用质量分数为10%的Er改性Cu/TiO2得到的Er10Cu/TiO2催化剂展现出优异的氧化还原性能和丰富的表面氧空位。Er10Cu/TiO2催化剂还具有较强的捕获和活化O2分子的能力,有利于增强对N2O的催化转化效率。 展开更多
关键词 氨动力船舶 N2O催化分解 Cu/TiO2催化剂 Er改性
暂未订购 下载PDF
Utilization of steelwork off-gases through methanol synthesis:Sulfur-induced dynamic migration of ZnOx over industrial Cu/ZnO/Al2O3 catalyst and the poisoning mechanism 认领 引用
18
作者 Yukun Tian Yu Zeng +5 位作者 Ziyang Chen Hua Tong Ming Chen Zhiyong Zhong Daiqi Ye Limin Chen 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2025年第12期659-673,共15页
The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonizatio... The reduction of carbon emissions in the steel industry is a significant challenge,and utilizing CO2 from carbon intensive steel industry off-gases for methanol production is a promising strategy for decarbonization.However,steelwork off-gases typically contain various impurities,including H2S,which can deactivate commercial methanol synthesis catalysts,Cu/ZnO/Al2O3(CZA).Reverse water-gas shift(RWGS)reaction is the predominant side reaction in CO2 hydrogenation to methanol which can occur at ambient pressure,enabling the decouple of RWGS from methanol production at high pressure.Then,a series of activated CZA catalysts has been in-situ pretreated in 400 ppm H2S/Ar at 250℃and tested for both RWGS reaction at ambient pressure and CO2 hydrogenation to methanol at high pressure.An innovative decoupling strategy was employed to isolate the RWGS reaction from the methanol synthesis process,enabling the investigation of the evolution of active site structures and the poisoning mechanism through elemental analysis,X-ray Diffraction,X-ray Photoelectron Spectroscopy,Fourier Transform Infrared Spectroscopy,Temperature Programmed Reduction and CO2 Temperature Programmed Desorption.The results indicate that there are different dynamic migration behaviors of ZnOx in the two reaction systems,leading to different poisoning mechanisms.These interesting findings are beneficial to develop sulfur resistant and durable highly efficient catalysts for CO2 hydrogenation to methanol,promoting the carbon emission reduction in steel industry. 展开更多
关键词 Steelwork off-gases CO2hydrogenation to methanol H2S Cu/Zn O/Al2O3catalysts ZnOxmigration Deactivation and promotion mechanisms
暂未订购 下载PDF
面向氨燃料发动机废气N2O去除的Cu/TiO2催化剂的性能及催化机理 认领 引用
19
作者 高宇 李坤 《科学技术与工程》 EI 北大核心 2025年第13期5681-5688,共8页
推动绿氨燃料上船应用已被普遍认为是实现全球航运业绿色低碳转型可行途径。然而,船用氨燃料发动机存在的N2O排放问题已成为阻碍氨动力船舶发展的关键技术瓶颈之一。针对这一问题,采用浸渍法制备出一系列以TiO2为载体的过渡金属... 推动绿氨燃料上船应用已被普遍认为是实现全球航运业绿色低碳转型可行途径。然而,船用氨燃料发动机存在的N2O排放问题已成为阻碍氨动力船舶发展的关键技术瓶颈之一。针对这一问题,采用浸渍法制备出一系列以TiO2为载体的过渡金属氧化物催化剂,考察了过渡金属元素类型对催化剂N2O去除性能的影响,并研究获得了性能优化的Cux/TiO2催化剂。结果表明,与Fe5/TiO2、Mn5/TiO2、Co5/TiO2、Ni5/TiO2催化剂相比,Cu5/TiO2催化剂显示出优异的催化活性,其N2O转化率可在350℃达到100%。除此之外,Cu5/TiO2催化剂还具有良好的抗水性能。5%是最佳的铜负载量。采用X射线衍射、N2吸附脱附、H2程序升温还原、O2程序升温脱附、原位漫反射傅里叶变换红外光谱等表征手段对性能较优的Cu5/TiO2催化剂的物化性质和表面反应中间体进行了表征,从多角度深入讨论了相关催化反应机理。结果显示,与其他Cux/TiO2催化剂相比,Cu5/TiO2催化剂具有较高的活性物种分散度、比表面积、氧空位含量以及较强的氧化还原性能,有利于其展现出较优的催化活性。Cu5/TiO2催化剂表面的主要活性物种为Cu2+和Cu+,N2O的吸附和解离是催化反应的关键步骤。 展开更多
关键词 氨燃料发动机 废气处理 Cu/TiO2催化剂 N2O催化分解
暂未订购 下载PDF
Reaction thermodynamics and kinetics on in situ Al_2O_3/Cu composites 认领 引用 被引量：4
20
作者 Li Guobin 1, Wu Jianjun 1, Guo Quanmei 2, Jiang Yanfei 1, Shen Yutian 1, Lei Tingquan 2 1. Department of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, P.R.Chi 《中国有色金属学会会刊：英文版》 1999年第3期617-622,共6页
The preferred internal oxidation of aluminum in Cu Al alloy was used to obtain in situ Al 2O 3/Cu composites. The reinforcement particles were mainly γ Al 2O 3, some θ Al 2O 3 and a little α Al 2O 3. Thermodynamics... The preferred internal oxidation of aluminum in Cu Al alloy was used to obtain in situ Al 2O 3/Cu composites. The reinforcement particles were mainly γ Al 2O 3, some θ Al 2O 3 and a little α Al 2O 3. Thermodynamics analyses show that the chemical reactions are 3Cu 2O+2Al=6Cu+Al 2O 3 or 3CuO+2Al=3Cu+Al 2O 3. A related equilibrium diagram was drawn. The experiments and investigation show that the formation rate of Al 2O 3 was controlled by the diffusion of oxygen in matrix. 展开更多
关键词 Al 2O 3/Cu composites internal oxidation thermodynamics kineticsDocument code: A
暂未订购 下载PDF
已选0条
引用分析
参考文献
引证文献
 统计分析
检索结果
已选文献
上一页 1 2 … 149 下一页 到第 页
在线咨询 使用帮助 返回顶部 意见反馈